10.5.5 - AFP maxes out CPU usage

Since installing the 10.5.5 update on our Intel Xserves, one sharing AFP Home directories will periodically begin to max out its CPU usage, this seems to happen every 2 or 3 days.
Over the space of an hour or two, CPU usage of the AppleFileServer process will increase from floating around 5% - 25% to a solid 400% (it's a Dual, Quad Xeon server so that's one whole CPU).
As an experiment, I manually disconnected all connected users (about 75 connections, 40ish that were not idle). CPU usage remained a steady 400% with 0 client connections.
Issuing a serveradmin stop afp, gives the response 'AFP Status: STOPPED' as it should, but in actually fact the process is still there. Clicking 'Stop' via ServerAdmin.app has no effect either.
The only thing that seems to work is a reboot (currently I have scheduled a 'shutdown -r now' for 1am every day).
Like I said, no problems with AFP prior to 10.5.5.
I hope there is a fix for this in 10.5.6 as it is a major problem.

Same problem here with AFP. Seems to be even worse with 10.5.6. I have two servers with home directories both doing the same thing. Only a restart seems to stop it. We also have SMB, windows users, disconnected on a random basis. Everyone may get disconnected or about 1/2 of them. This happens once or twice a week. If we use server admin to change any ACL's the SMB users also get disconnected. We are looking at switching back to Windows servers. We have had these issues since switching our home directories last summer. We have been working with a local vendor and Apple SE with no resolutions.

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